Aaron Paul didn't just take part in the dance party Saturday in the VIP section of the ASOS Rocks party at the Hard Rock Hotel. The two-time Emmy winning actor, best known for his role as Jesse Pinkman on AMC's "Breaking Bad," actually started it by grabbing strangers by the hand and bringing them over to his makeshift dance floor one by one.

"We need to get everyone dancing," announced Paul, who was joined by The Lumineers drummer Jeremiah Fraites on the dance floor and later that night at The Underground.

Paul has managed to be one of the few constants during Lollapalooza weekend, where the celebrity guest list changes significantly year after year (we've seen McLovin from "Superbad" one year and chef Guy Fieri the next). The approachable Idaho native never seems to miss the annual three-day music festival in Grant Park and its accompanying parties, including Sunday's M.A.C. Cosmetics Cocktail Party at Vertigo Sky Lounge in the Dana Hotel.

Jack Osbourne ("The Osbournes") was on hand for the second year in a row and had dinner Friday at Paris Club with Salling and Shenae Grimes ("90210") before heading to upstairs club Studio Paris. Kellan Lutz ("Twilight") partied Friday at The Underground and checked out the It's So Miami lounge in the Hard Rock hotel Saturday while here for his second Lollapalooza in three years. Marcus Mumford of Mumford & Sons, which performed at the festival for the second time in four years, dined Wednesday at Sunda. Members of Mumford & Sons, Vampire Weekend and Crystal Castles also dined at Nellcote last week, as did Lana Del Rey, separately.

"Chicago Fire" cast members took a break from filming the firefighter drama Saturday to attend Gilt City Chicago's Better Than Backstage Rooftop Pool Party at EnV Apartments in River North, which also was attended by Cabrera and Hough and included a performance by MS MR. Pusha T played Hennessy's Never Stop. Never Settle party Friday at Untitled, and during her performance Thursday at the W Chicago-Lakeshore Hotel's Symmetry Live party Jessie Ware proudly boasted that her sister Hannah Ware is filming the new TV show "Betrayal" in Chicago. The Vaccines played the Rolling Stone Stage party Saturday at Studio Paris, one of my favorite parties every year. Chance the Rapper didn't end up performing at artist Hebru Brantley's Penny Candy pop-up shop in the South Loop as scheduled, but Brantley's pal Lupe Fiasco made an appearance Friday to lend his support.

AnnaSophia Robb ("The Carrie Diaries") was spotted Saturday at the CK One Color Lounge in the Hard Rock Hotel and tweeted video of The Dolls' excellent performance at the ASOS Rocks party. Jennie Garth ("90210") dined Friday and Saturday at Hub 51 and tweeted photos from her stage-side view in Grant Park. Burlesque dancer Dita Von Teese was hard to miss at the festival Friday. Marilyn Manson's fashionable ex-wife was the one walking around in a black lace outfit with a bolero hat and high heels amid a sea of shorts and tank tops.

About this week: Singer Sheryl Crow will perform Friday at Macy's Glamorama at Harris Theater at Millennium Park. … Bill Murray and Matthew Perry ("Friends") are scheduled to take part Saturday in retired Cub Kerry Wood's Woody's Wiffleball Classic at Wrigley Field. Former "American Idol" winner Lee DeWyze will sing the national anthem at the benefit for the Wood Family Foundation.

Watch video from Lollapalooza's party scene at chicagotribune.com/luis.